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16#include "qemu/osdep.h"
17#include "net/net.h"
18#include "net/tap.h"
19#include "net/vhost-user.h"
20
21#include "hw/virtio/virtio-net.h"
22#include "net/vhost_net.h"
23#include "qemu/error-report.h"
24
25
26#ifdef CONFIG_VHOST_NET
27#include <linux/vhost.h>
28#include <sys/socket.h>
29#include <linux/kvm.h>
30#include <netpacket/packet.h>
31#include <net/ethernet.h>
32#include <net/if.h>
33#include <netinet/in.h>
34
35
36#include "standard-headers/linux/virtio_ring.h"
37#include "hw/virtio/vhost.h"
38#include "hw/virtio/virtio-bus.h"
39
40struct vhost_net {
41 struct vhost_dev dev;
42 struct vhost_virtqueue vqs[2];
43 int backend;
44 NetClientState *nc;
45};
46
47
48static const int kernel_feature_bits[] = {
49 VIRTIO_F_NOTIFY_ON_EMPTY,
50 VIRTIO_RING_F_INDIRECT_DESC,
51 VIRTIO_RING_F_EVENT_IDX,
52 VIRTIO_NET_F_MRG_RXBUF,
53 VIRTIO_F_VERSION_1,
54 VHOST_INVALID_FEATURE_BIT
55};
56
57
58static const int user_feature_bits[] = {
59 VIRTIO_F_NOTIFY_ON_EMPTY,
60 VIRTIO_RING_F_INDIRECT_DESC,
61 VIRTIO_RING_F_EVENT_IDX,
62
63 VIRTIO_F_ANY_LAYOUT,
64 VIRTIO_F_VERSION_1,
65 VIRTIO_NET_F_CSUM,
66 VIRTIO_NET_F_GUEST_CSUM,
67 VIRTIO_NET_F_GSO,
68 VIRTIO_NET_F_GUEST_TSO4,
69 VIRTIO_NET_F_GUEST_TSO6,
70 VIRTIO_NET_F_GUEST_ECN,
71 VIRTIO_NET_F_GUEST_UFO,
72 VIRTIO_NET_F_HOST_TSO4,
73 VIRTIO_NET_F_HOST_TSO6,
74 VIRTIO_NET_F_HOST_ECN,
75 VIRTIO_NET_F_HOST_UFO,
76 VIRTIO_NET_F_MRG_RXBUF,
77
78
79 VIRTIO_NET_F_GUEST_ANNOUNCE,
80
81 VIRTIO_NET_F_MQ,
82
83 VHOST_INVALID_FEATURE_BIT
84};
85
86static const int *vhost_net_get_feature_bits(struct vhost_net *net)
87{
88 const int *feature_bits = 0;
89
90 switch (net->nc->info->type) {
91 case NET_CLIENT_OPTIONS_KIND_TAP:
92 feature_bits = kernel_feature_bits;
93 break;
94 case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
95 feature_bits = user_feature_bits;
96 break;
97 default:
98 error_report("Feature bits not defined for this type: %d",
99 net->nc->info->type);
100 break;
101 }
102
103 return feature_bits;
104}
105
106uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
107{
108 return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
109 features);
110}
111
112void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
113{
114 net->dev.acked_features = net->dev.backend_features;
115 vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
116}
117
118uint64_t vhost_net_get_max_queues(VHostNetState *net)
119{
120 return net->dev.max_queues;
121}
122
123static int vhost_net_get_fd(NetClientState *backend)
124{
125 switch (backend->info->type) {
126 case NET_CLIENT_OPTIONS_KIND_TAP:
127 return tap_get_fd(backend);
128 default:
129 fprintf(stderr, "vhost-net requires tap backend\n");
130 return -EBADFD;
131 }
132}
133
134struct vhost_net *vhost_net_init(VhostNetOptions *options)
135{
136 int r;
137 bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
138 struct vhost_net *net = g_malloc(sizeof *net);
139
140 if (!options->net_backend) {
141 fprintf(stderr, "vhost-net requires net backend to be setup\n");
142 goto fail;
143 }
144 net->nc = options->net_backend;
145
146 net->dev.max_queues = 1;
147 net->dev.nvqs = 2;
148 net->dev.vqs = net->vqs;
149
150 if (backend_kernel) {
151 r = vhost_net_get_fd(options->net_backend);
152 if (r < 0) {
153 goto fail;
154 }
155 net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
156 ? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
157 net->backend = r;
158 net->dev.protocol_features = 0;
159 } else {
160 net->dev.backend_features = 0;
161 net->dev.protocol_features = 0;
162 net->backend = -1;
163
164
165 net->dev.vq_index = net->nc->queue_index * net->dev.nvqs;
166 }
167
168 r = vhost_dev_init(&net->dev, options->opaque,
169 options->backend_type);
170 if (r < 0) {
171 goto fail;
172 }
173 if (backend_kernel) {
174 if (!qemu_has_vnet_hdr_len(options->net_backend,
175 sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
176 net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
177 }
178 if (~net->dev.features & net->dev.backend_features) {
179 fprintf(stderr, "vhost lacks feature mask %" PRIu64
180 " for backend\n",
181 (uint64_t)(~net->dev.features & net->dev.backend_features));
182 vhost_dev_cleanup(&net->dev);
183 goto fail;
184 }
185 }
186
187 vhost_net_ack_features(net, 0);
188 return net;
189fail:
190 g_free(net);
191 return NULL;
192}
193
194static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
195{
196 net->dev.vq_index = vq_index;
197}
198
199static int vhost_net_start_one(struct vhost_net *net,
200 VirtIODevice *dev)
201{
202 struct vhost_vring_file file = { };
203 int r;
204
205 net->dev.nvqs = 2;
206 net->dev.vqs = net->vqs;
207
208 r = vhost_dev_enable_notifiers(&net->dev, dev);
209 if (r < 0) {
210 goto fail_notifiers;
211 }
212
213 r = vhost_dev_start(&net->dev, dev);
214 if (r < 0) {
215 goto fail_start;
216 }
217
218 if (net->nc->info->poll) {
219 net->nc->info->poll(net->nc, false);
220 }
221
222 if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
223 qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
224 file.fd = net->backend;
225 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
226 const VhostOps *vhost_ops = net->dev.vhost_ops;
227 r = vhost_ops->vhost_net_set_backend(&net->dev, &file);
228 if (r < 0) {
229 r = -errno;
230 goto fail;
231 }
232 }
233 }
234 return 0;
235fail:
236 file.fd = -1;
237 if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
238 while (file.index-- > 0) {
239 const VhostOps *vhost_ops = net->dev.vhost_ops;
240 int r = vhost_ops->vhost_net_set_backend(&net->dev, &file);
241 assert(r >= 0);
242 }
243 }
244 if (net->nc->info->poll) {
245 net->nc->info->poll(net->nc, true);
246 }
247 vhost_dev_stop(&net->dev, dev);
248fail_start:
249 vhost_dev_disable_notifiers(&net->dev, dev);
250fail_notifiers:
251 return r;
252}
253
254static void vhost_net_stop_one(struct vhost_net *net,
255 VirtIODevice *dev)
256{
257 struct vhost_vring_file file = { .fd = -1 };
258
259 if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
260 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
261 const VhostOps *vhost_ops = net->dev.vhost_ops;
262 int r = vhost_ops->vhost_net_set_backend(&net->dev, &file);
263 assert(r >= 0);
264 }
265 }
266 if (net->nc->info->poll) {
267 net->nc->info->poll(net->nc, true);
268 }
269 vhost_dev_stop(&net->dev, dev);
270 vhost_dev_disable_notifiers(&net->dev, dev);
271}
272
273int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
274 int total_queues)
275{
276 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
277 VirtioBusState *vbus = VIRTIO_BUS(qbus);
278 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
279 int r, e, i;
280
281 if (!k->set_guest_notifiers) {
282 error_report("binding does not support guest notifiers");
283 return -ENOSYS;
284 }
285
286 for (i = 0; i < total_queues; i++) {
287 struct vhost_net *net;
288
289 net = get_vhost_net(ncs[i].peer);
290 vhost_net_set_vq_index(net, i * 2);
291
292
293
294
295
296 if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
297 dev->use_guest_notifier_mask = false;
298 }
299 }
300
301 r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
302 if (r < 0) {
303 error_report("Error binding guest notifier: %d", -r);
304 goto err;
305 }
306
307 for (i = 0; i < total_queues; i++) {
308 r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
309
310 if (r < 0) {
311 goto err_start;
312 }
313 }
314
315 return 0;
316
317err_start:
318 while (--i >= 0) {
319 vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
320 }
321 e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
322 if (e < 0) {
323 fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
324 fflush(stderr);
325 }
326err:
327 return r;
328}
329
330void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
331 int total_queues)
332{
333 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
334 VirtioBusState *vbus = VIRTIO_BUS(qbus);
335 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
336 int i, r;
337
338 for (i = 0; i < total_queues; i++) {
339 vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
340 }
341
342 r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
343 if (r < 0) {
344 fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
345 fflush(stderr);
346 }
347 assert(r >= 0);
348}
349
350void vhost_net_cleanup(struct vhost_net *net)
351{
352 vhost_dev_cleanup(&net->dev);
353 g_free(net);
354}
355
356int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
357{
358 const VhostOps *vhost_ops = net->dev.vhost_ops;
359 int r = -1;
360
361 if (vhost_ops->vhost_migration_done) {
362 r = vhost_ops->vhost_migration_done(&net->dev, mac_addr);
363 }
364
365 return r;
366}
367
368bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
369{
370 return vhost_virtqueue_pending(&net->dev, idx);
371}
372
373void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
374 int idx, bool mask)
375{
376 vhost_virtqueue_mask(&net->dev, dev, idx, mask);
377}
378
379VHostNetState *get_vhost_net(NetClientState *nc)
380{
381 VHostNetState *vhost_net = 0;
382
383 if (!nc) {
384 return 0;
385 }
386
387 switch (nc->info->type) {
388 case NET_CLIENT_OPTIONS_KIND_TAP:
389 vhost_net = tap_get_vhost_net(nc);
390 break;
391 case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
392 vhost_net = vhost_user_get_vhost_net(nc);
393 break;
394 default:
395 break;
396 }
397
398 return vhost_net;
399}
400
401int vhost_set_vring_enable(NetClientState *nc, int enable)
402{
403 VHostNetState *net = get_vhost_net(nc);
404 const VhostOps *vhost_ops = net->dev.vhost_ops;
405
406 if (vhost_ops->vhost_set_vring_enable) {
407 return vhost_ops->vhost_set_vring_enable(&net->dev, enable);
408 }
409
410 return 0;
411}
412
413#else
414uint64_t vhost_net_get_max_queues(VHostNetState *net)
415{
416 return 1;
417}
418
419struct vhost_net *vhost_net_init(VhostNetOptions *options)
420{
421 error_report("vhost-net support is not compiled in");
422 return NULL;
423}
424
425int vhost_net_start(VirtIODevice *dev,
426 NetClientState *ncs,
427 int total_queues)
428{
429 return -ENOSYS;
430}
431void vhost_net_stop(VirtIODevice *dev,
432 NetClientState *ncs,
433 int total_queues)
434{
435}
436
437void vhost_net_cleanup(struct vhost_net *net)
438{
439}
440
441uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
442{
443 return features;
444}
445void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
446{
447}
448
449bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
450{
451 return false;
452}
453
454void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
455 int idx, bool mask)
456{
457}
458
459int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
460{
461 return -1;
462}
463
464VHostNetState *get_vhost_net(NetClientState *nc)
465{
466 return 0;
467}
468
469int vhost_set_vring_enable(NetClientState *nc, int enable)
470{
471 return 0;
472}
473#endif
474